Rotary machine

ABSTRACT

A rotary machine sucking in working fluid through a suction port into a housing and discharging it through the discharge port, provided with a motor stator provided at an inside circumferential surface of the housing and having inside surfaces which include a step surface designed to enclose a housing interior cavity by the inside surfaces; first and second motor rotors arranged at the insides of the inside surfaces separated by the step surface of the motor stator; and first and second rotational units, the first and second rotational units coupled to the first and second motor rotors respectively, and the first and second rotational units supported at the housing adjoiningly and eccentrically to each other.

TECHNICAL FIELD

The present invention relates to a rotary machine, more particularly arotary machine compressing a working fluid and able to rotate byexpansion of the fluid. Further, it relates to a rotary machinecompressing and pumping a non-compressible fluid and able to rotate bythe fluid wherein the volume changes due to an orbiting part as seen inscroll and rolling piston types etc.

BACKGROUND ART

Rotary fluid machines used in vapor compression type refrigerationair-conditioning systems and the like since the past, have beennoteworthy for their relatively high efficiency, low vibration, and lownoise in comparison to other types of compressors, for example,reciprocating compressors and screw compressors. This is because ascroll compressor, in principle, performs compression operationssimultaneously in multiple chambers.

Further, in order to effectively achieve a feeling of heating and afeeling of cooling in air-conditioning systems etc., there has beendesired to be able to operate the compressor while maintaining a highefficiency over a wide range from slow to high speeds.

For example, Japanese Unexamined Patent Publication No. 5-332262discloses a compressor designed to engage two parts having scroll lapsand driving both with different motors. International Patent PublicationWO 2006/067844 discloses a compressor engaging a part having a scrolllap on both surfaces with two fixed scrolls and driving the former witha motor.

However, the compressor disclosed in Japanese Unexamined PatentPublication No. 5-332262 uses two motors, so its mass is large, a largersize becomes unavoidable, and production costs rise also. Further,driving the two motors used simultaneously is difficult.

On the other hand, in the compressor disclosed in International PatentPublication WO 2006/067844 (W02006/067844-A1), there were the problemsthat machining of a double surface scroll is difficult and, further,assembly of the component parts is also difficult. Further, thiscompressor has a structure in which a shaft penetrates through thecenter of the scroll lap, so the outside circumference and the massincrease and the size becomes large.

SUMMARY OF THE INVENTION

The present invention was proposed to solve the above problems and hasas its object to provide a rotary machine aiming at smaller size andlighter weight.

As a means for solving the problem, in the aspect of the invention inclaim 1, there is provided a rotary machine sucking in working fluidthrough a suction port into its housing to render it a high pressure anddischarging it through a discharge port, provided with a motor statorprovided at an inside circumferential surface of the housing and havinginside surfaces which include a step surface designed to enclose ahousing interior cavity by the inside surfaces; first and second motorrotors arranged at the insides of the inside surfaces separated by thestep surface of the motor stator; and first and second rotational units,the first and second rotational units coupled to the first and secondmotor rotors respectively, and the first and second rotational unitssupported at the housing adjoiningly and eccentrically to each other;the first and second rotational units further provided with workingchambers, the volumes of the working chambers formed by the first andsecond rotational units made variable by rotation together with thefirst and second motor rotors, which render the working fluid sucked inthrough the suction port a high pressure by reduction of the volumes;and high pressure working fluid being discharged from the workingchambers through the discharge port.

According to this, a motor stator having inside surfaces including astep surface designed to enclose the housing interior cavity is providedat the housing inside circumferential surface so as to drive the firstand second rotational parts together with the first and second motorrotors at the inside of this inside surface, so a smaller size, lighterweight, and further cost reduction can be realized.

In the aspect of the invention in claim 2, there is provided a rotarymachine sucking in working fluid through a suction port into its housingand able to rotate by expansion of the fluid, provided with a motorstator provided at an inside circumferential surface of the housing andhaving inside surfaces which include a step surface designed to enclosea housing interior cavity by the inside surfaces; first and second motorrotors arranged at the insides of the inside surfaces separated by thestep surface of the motor stator; and first and second rotational units,the first and second rotational units coupled to the first and secondmotor rotors respectively, and the first and second rotational unitssupported at the housing adjoiningly and eccentrically to each other;the first and second rotational units further provided with workingchambers, the volumes of the working chambers formed by the first andsecond rotational units made variable by rotation of the first andsecond rotational units, which expand the working fluid introduced intothe housing; and expansion of the working fluid by the working chamberscausing the first and second rotational units and the first and secondmotor rotors to rotate so as to extract electricity.

According to this, working fluid introduced into the housing is expandedby the working chambers so as to make the first and second motor rotorsrotate together with the first and second rotational units and take outelectricity, so a smaller size, lighter weight, and further lower costscan be realized.

In the aspect of the invention in claim 3, there is provided the aspectof the invention as set forth in claim 1, wherein the first and secondrotational units are first and second rotational units in a scroll typerotary machine, the first and second rotational units provided with afirst scroll rotor and a second scroll rotor eccentrically engaging withthe first scroll rotor; and the first and second scroll rotors arerotatably supported at the housing by respective bearings adjoining andeccentric to each other, and the first and second scroll rotors arerespectively supported through the first and second motor rotors bythrust bearings at the housing in the thrust direction.

According to this, first and second second scroll rotors (61, 71) aredriven while engaging with each other inside a motor stator having aninner diameter able to receive the first and second scroll rotors, so asmaller size, lighter weight, and further lower costs can be realized.

In the aspect of the invention as set forth in claim 4, there isprovided the aspect of the invention as set forth in claim 1, whereinthe first and second rotational unit are first and second rotationalunits in a scroll type rotary machine, the first and second rotationalunits provided with a first scroll rotor having a substantially circularend plate part and spiral shaped scroll vane part and a second scrollpart having a substantially circular end plate part and spiral shapedscroll vane part; the scroll vane parts of the first scroll rotor andsecond scroll rotor engage eccentrically with each other to thereby forma plurality of working chambers taking in working fluid and rendering ithigh pressure between the scroll vane parts; and a high pressure cavityis defined inside of the inside wall at the side opposite to thedischarge port in the housing so that a first pressure is applied toeither of the end plate parts of the first or second scroll rotor, asecond pressure applied to the plurality of the working chambers as awhole being set so as to become smaller than the first pressure so as toeliminate the bearing for receiving the force in the thrust directionfor the inside wall of the housing at the side defining the highpressure cavity.

According to this, the bearing in the thrust direction for the insidewall of the housing at the side where the high pressure cavity isdefined can be omitted, so the structure can be simplifiedsignificantly, contributing to smaller size and lighter weight.

In an aspect of the invention in claim 5, there is provided a rotarypiston type rotary machine sucking in working fluid through a suctionport into its housing to render it a high pressure and discharging itthrough a discharge port, provided with a motor stator provided at aninside circumferential surface of the housing and having inside surfaceswhich include a step surface designed to enclose a housing interiorcavity by the inside surfaces; first and second motor rotors arranged atthe insides of the inside surfaces separated by the step surface of themotor stator; and first and second rotational units, the first andsecond rotational units coupled to the first and second motor rotorsrespectively, and the first and second rotational units supported at thehousing adjoiningly and eccentrically to each other; the first andsecond rotational units provided with first and second rotorsrespectively arranged between a first side plate and middle plate orbetween the middle plate and a second side plate through a shaft, firstand second cylinders arranged eccentric to the first and second rotorsrespectively, first and second working chambers respectively formedbetween the first rotor and first cylinder or between the second rotorand second cylinder, and first and second vanes protruding out from thefirst and second cylinders toward the first and second rotors in thefirst and second working chambers so as to abut against the first andsecond rotors by first and second spring members.

According to this, there can be provided a rolling piston type rotarymachine enabling a simplified structure, smaller size, and lighterweight.

In the aspect of the invention as set forth in claim 6, there isprovided a swing type rotary machine sucking in working fluid through asuction port into its housing to render it a high pressure anddischarging it through a discharge port, provided with a motor statorprovided at an inside circumferential surface of the housing and havinginside surfaces which include a step surface designed to enclose ahousing interior cavity by the inside surfaces; first and second motorrotors arranged at the insides of the inside surfaces separated by thestep surface of the motor stator; and first and second rotational units,the first and second rotational units coupled to the first and secondmotor rotors respectively, and the first and second rotational unitssupported at the housing adjoiningly and eccentrically to each other;the first and second rotational units provided with first and secondrotors respectively arranged between a first side plate and middle plateor between the middle plate and a second side plate through a shaft,first and second cylinders arranged eccentric to the first and secondrotors respectively, first and second working chambers respectivelyformed between the first rotor and first cylinder or between the secondrotor and second cylinder, and first and second driving pins providedprotruding out from the first and second rotors and coupling the firstand second rotors to the first and second cylinders swingingly.

According to this, there can be provided a rolling piston type rotarymachine enabling a simplified structure, smaller size, and lighterweight.

In the aspect of the invention as set forth in claim 7, there isprovided the invention as set forth in claim 1, wherein the first andsecond rotational unit are 180 degrees out of phase with each other andare arranged inside of the motor stator in the cavity inside thehousing.

According to this, when the first and second rotational units rotate, adynamic balance of the rotating elements can be achieved, and vibrationcan be suppressed.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a cross-sectional explanatory view of a scroll type rotarymachine of an embodiment of the present invention.

FIG. 2 is a cross-sectional explanatory view showing another embodimentof a scroll rotor in the scroll type rotary machine shown in FIG. 1.

FIG. 3A is a cross-sectional explanatory view of the main parts of therotary machine shown in FIG. 1 when cut along a line A-A. Along withFIGS. 3B to 3D, it explains the process of the scroll vanes of the firstand second scroll rotors compressing a working fluid.

FIG. 3B is a cross-sectional explanatory view of the main parts of therotary machine shown in FIG. 1 when cut along a line A-A.

FIG. 3C is a cross-sectional explanatory view of the main parts of therotary machine shown in FIG. 1 when cut along a line A-A.

FIG. 3D is a cross-sectional explanatory view of the main parts of therotary machine shown in FIG. 1 when cut along a line A-A.

FIG. 4 is a cross-sectional explanatory view of a scroll type rotarymachine of another embodiment of the present invention.

FIG. 5 is a cross-sectional explanatory view of a rolling piston typerotary machine of an embodiment of the present invention.

FIG. 6 is a cross-sectional explanatory view of the rolling piston typerotary machine shown in FIG. 5 when cut along a line B-B.

FIG. 7A is a cross-sectional explanatory view of the main parts of therolling piston type rotary machine shown in FIG. 5 explaining theprocess of it compressing the working fluid.

FIG. 7B is a cross-sectional explanatory view of the main parts of therolling piston type rotary machine shown in FIG. 5 explaining theprocess of it compressing the working fluid.

FIG. 7C is a cross-sectional explanatory view of the main parts of therolling piston type rotary machine shown in FIG. 5 explaining theprocess of it compressing the working fluid.

FIG. 8 is a cross-sectional explanatory view of a swing type rotarymachine of an embodiment of the present invention.

FIG. 9 is a cross-sectional explanatory view of the swing type rotarymachine shown in FIG. 8 when cut along a line C-C.

FIG. 10A is a cross-sectional explanatory view of the main parts of theswing type rotary machine shown in FIG. 8 explaining the process of itcompressing the working fluid.

FIG. 10B is a cross-sectional explanatory view of the main parts of theswing type rotary machine shown in FIG. 8 explaining the process of itcompressing the working fluid.

FIG. 10C is a cross-sectional explanatory view of the main parts of theswing type rotary machine shown in FIG. 8 explaining the process of itcompressing the working fluid.

DESCRIPTION OF EMBODIMENTS

Below, embodiments of the rotary machine of the present invention willbe explained.

First Embodiment

FIG. 1 is a cross-sectional view showing the overall configuration of acompressor when using a hermetic scroll type rotary machine as acompressor for an air-conditioning machine. This scroll type rotarymachine 1 is a rotary machine that sucks in working fluid through asuction port 14 into its housing 2 to render it a high pressurize anddischarges it through a discharge port 15.

This rotary machine 1 is provided with a motor stator 3 provided at aninside circumferential surface of the housing 2 and having insidesurfaces, which include a step surface S, designed to enclose a housinginterior cavity by its inside surfaces, first and second motor rotors 4,5 arranged at the insides of the inside surfaces of the motor stator 3separated at the step surface S, and first and second rotational units6, 7, the first and second rotational units 6, 7 coupled to the firstand second motor rotors 4, 5 respectively and the first and secondrotational units 6, 7 supported by the bearings 8, 8′ at the housing 2adjoiningly and eccentrically to each other.

Further, the first and second rotational units 6, 7 are provided withworking chambers 12 having volumes changed by making the first andsecond rotational units 6, 7 rotate along with the first and secondmotor rotors 4, 5 and rendering working fluid that is sucked in throughthe suction port 14 to the housing 2 a high pressure by reducing thevolumes.

At the inside surfaces of the motor stator 3, the inside surfaces facingthe first and second rotational units 6, 7 are connected at the stepsurface S, whereby equal sized first and second cylindrical cavities 31,32 are formed. The first and second rotational units 6, 7 have axialcenters eccentric with each other and can rotate about theircorresponding axial centers.

The first and second rotational units 6, 7 are provided with a firstscroll rotor 61 and a second scroll rotor 71 eccentrically engaging withthe first scroll rotor 61. The first scroll rotor 61 has a substantiallycircular end plate part 61 a and a spiral shaped scroll vane part 61 c.The second scroll rotor 71 has a substantially circular end plate part71 a and a substantially same shaped spiral shaped scroll vane part 71 cengaging with the scroll vane part 61 c of the first scroll rotor 61. Byeccentrically engaging the scroll vane parts 61 c, 71 c to each other, aplurality of crescent shaped working chambers 12 taking in andcompressing working fluid are formed between the spiral shaped scrollvane parts 61 c, 71 c.

The first and second scroll rotors 61, 71 are supported rotatably withrespect to the housing 2 by bearings 8, 8′ respectively and aresupported in the thrust direction (direction of force acting in theaxial direction) by thrust bearings 10, 11, 10′, 11′ by interposing thefirst and second motor rotors 5, 7 respectively.

At one surface of the end plate part 61 a of the first scroll rotor 61,there is formed a scroll vane part 61 c. At the other surface of the endplate part 61 a, there is provided a substantially cylindrical boss part61 b protruding toward a cover 21 of the housing 2. A holding part 21 ais protrudes out at the cover 21 of the housing 2. The first scrollrotor 61 has the cylindrical boss part 61 b inserted into the holdingpart 21 a of the housing 2 whereby it is rotatably supported by thebearing 8.

At one surface of the end plate part 71 a of the second scroll rotor 71,there is formed a scroll vane part 71 c. At the other surface of the endplate part 71 a, there is provided a protruding boss part 71 b. Thesecond scroll rotor 71 has the boss part 71 b inserted into the holdingpart 22 a protruding out from the bottom 22 side of the housing 2,whereby it is rotatably supported by the bearing 8′.

The first motor rotor 4 is fixed to the end plate part 61 a where of thefirst scroll rotor 61 at the side where the boss part 61 b is formed. Apermanent magnet 41 is set at the first motor rotor 4. The first motorrotor 4 is supported in the thrust direction by the cover 21 of thehousing 2 and the thrust bearings 10, 11 without hinderance to rotation.

Further, the second motor rotor 5 is fixed to the end plate part 71 a ofthe second scroll rotor 71 at the side where boss part 71 b is formed. Apermanent magnet 51 is set at the second motor rotor 5. Further, thesecond motor rotor 5 is supported by the bottom 22 of the housing 2 andthe thrust bearings 10′, 11′ without hinderance to rotation.

The first and second scroll rotors 61, 71 have scroll vane parts 61 c,71 c eccentrically engaging with each other, whereby the spiral shapedvane parts 61 c, 71 c between them form a plurality of crescent shapedworking chambers 12 (explained later) taking in and compressing workingfluid. At the center region of the first and second scroll rotors 61,71, there is formed a high pressure working chamber (not shown) wherethe pressure of the compressed working fluid is the highest. At the bosspart 61 b at the first scroll rotor 61, there is formed a discharge port13 for discharging the compressed working fluid from the high pressureworking chamber.

At the housing 2 of the scroll type rotary machine 1, a suction port 14is formed at the bottom 22 side for taking in working fluid to thehousing 2. At the center of the cover 21 of the housing 2, a dischargeport 15 is formed. The suction port 14 is connected to the workingchambers 12 formed between the spiral shaped scroll vane parts 61 c, 71c of the first and second scroll rotors 61, 71.

The discharge port 15 at the center of the cover 21 of the housing 2 isconnected with the discharge port 13 of the boss part 61 b at the firstscroll rotor 61.

At the passage from the discharge port 13 to the discharge port 15, reedvalve 16 is interposed biased so as to normally block the passage with aspring member 16 s.

If the pressure of working fluid at the high pressure working chamberexisting at the center region of the first and second scroll rotors 61,71 exceeds a predetermined pressure, it becomes larger than the biasingforce from the spring member 16 c at the the reed valve 16. Therefore,the passage from the discharge port 13 to the discharge port 15 isopened up, and high pressure working fluid flows out from the dischargeport 15.

At the bottom 22 of the housing 2, there is interposed a hermeticterminal 17. Electricity is fed through the hermetic terminal 17 from anexternal controller (not shown) to a coil 3 c of the motor stator 3.

The reed valve 16 can also be replaced with a poppet valve 18 such asshown in FIG. 2. The poppet valve 18 openably blocks the passage fromthe discharge port 13 to the discharge port 15 and is configured from avalve element 18 a, spring member 18 b, and spring holder 18 c.

Next, the action of the scroll type rotary machine 1 of the presentinvention will be explained.

If electricity is fed to the motor stator 3 inside the housing 2 throughthe hermetic terminal 17 from the external controller, the motor stator3 is magnetized, whereby the first and second motor rotors 4, 5 set withthe permanent magnets 41, 51 are made to rotate. The first and secondmotor rotors 4, 5 are coupled with the first and second scroll rotors61, 71, so these rotate as one unit. The first and second scroll rotors61, 71 are supported respectively by the bearings 8, 8′ eccentric to thehousing 2, so the scroll vane parts 61 c, 71 c rotate eccentricallywhile engaging with each other centered about these bearings 8, 8′.

When the scroll type rotary machine 1 is in operation, the first andsecond scroll rotors 61, 71 rotate while the scroll vane parts 61 c, 71c engage. Due to this, working fluid that entered the housing interiorcavity from the suction port 14 at the bottom 22 of the housing 2spreads to the working chambers 12 between the spiral shaped vane parts61 c, 71 c. Then, working fluid is gradually fed to the scroll center.The compressed working fluid from the high pressure working chamber atthe center region of the first and second scroll rotors 61, 71 pushesthrough the reed valve 16, passes through the discharge port 13, and isdischarged outside from the discharge port 15 at the center of the cover21 of the housing 2.

In the above way, the scroll type rotary machine 1 is configured fromthe first and second motor rotors integral with the first and secondscroll rotors 61, 71 and a motor stator 3 having first and secondcylindrical cavities 31, 32 eccentric to each other, so smaller size,lighter weight, and further lower costs can be realized.

The process of compressing the working fluid will be explained withreference to FIG. 3A to FIG. 3D. FIG. 3A to FIG. 3D show an engagedstate of the scroll vane parts 61 c, 71 c of the first and second scrollrotors 61, 71 of the rotary machine shown in FIG. 1 when cut along theline A-A.

When the scroll vane parts 61 c, 71 c engage and rotate, the rotationalposition of the scroll vane part 61 c shown at FIG. 3A (hereinafter,referred to as “phase”) is defined as “0” degree. At this time, thescroll vane part 71 c of the second scroll rotor 71 is 180 degrees outof phase from the scroll vane part 61 c of the first scroll rotor 61.

Below, in FIG. 3B, the phase of the vane part 61 c of the first scrollrotor 61 is shown to be 90 degrees, in FIG. 3C, the phase of the vanepart 61 c of the first scroll rotor 61 is shown to be 180 degrees, andin FIG. 3D, the phase of the vane part 61 c of the first scroll rotor 61is shown to be 270 degrees.

In the engaged state of the scroll vane parts 61 c, 61 c shown in FIG.3A, the working fluid is sealed by the working chambers 12α1, 12β1. Fromthis state, the first and second scroll rotors 61, 71 rotate integrallyalong with the rotation of the first and second motor rotors 4, 5. Theworking chamber 12α1 becomes narrower in the order of12α1→12α2→12α3→12α4→12α5, whereby the working fluid is compressed andrendered a high pressure. When the working chamber 12 formed between thescroll vane parts 61 c, 71 c reaches the center working chamber 12γ, itreaches a position where it is able to connect with the discharge port13 (the reed valve 16 is in a closed state). Further, the workingchamber 12 becomes narrower in the order of the working chamber12δ→working chamber 12ε. If becoming higher than a predeterminedpressure, the fluid pushes through the reed valve 16 at the dischargeport 13 and is discharged from the discharge port 15 at the center ofthe cover 21 of the housing 2 to the outside.

On the other hand, the working chamber 1231 also similarly becomesnarrower in the order of 12β1→12β2→12β3→12β4→12β5, whereby the workingfluid is compressed and rendered a high pressure. If the working chamber12 formed between the scroll vane parts 61 c, 71 c becomes the centralworking chamber 12γ, it reaches a position where it is able to connectwith the discharge port 13. Further, the working chamber 12 becomesnarrower in the order of working chamber 12δ→working chamber 12ε, whereif the working fluid has a pressure higher than a predeterminedpressure, it pushes through the reed valve 16 at the discharge port 13and is discharged from the discharge port 15 at the center of the cover21 of the housing 2 to the outside.

Regarding the forces the working fluid of the working chambers 12applies to the first and second scroll rotors 61, 71, the force in theradial direction is supported by the bearing 8, and the force in thethrust direction is supported by the thrust bearings 10, 11, so thefirst and second motor rotors 4, 5 and the first and second scrollrotors 61, 71 operate without hinderance to rotation and execute theabove mentioned process of compressing the working fluid.

The scroll type rotary machine 1 performs a rotation operation in astate where the scroll vane parts 61 c, 71 c are mutually 180 degree outof phase, so a dynamic balance in the rotation operation can be achievedand vibration can be suppressed.

Second Embodiment

A second embodiment of the scroll type rotary machine 1 of the presentinvention will be explained below.

In the scroll type rotary machine 1 shown in FIG. 1, among the forcesapplied to the first and second scroll rotor 61, 71, the force in theradial direction is supported by the bearings 8, 8′ and the force in thethrust direction is supported by the thrust bearings 10, 11. On theother hand, in the second embodiment of the scroll type rotary machine 1shown in FIG. 4, the thrust bearings 10′, 11′ between the second motorrotor 5 rotating integrally with the second scroll rotor 71 and thebottom 22 of the housing 2 are omitted.

In the scroll type rotary machine 1 shown in FIG. 4, a high pressurecavity 71 d for forming a high pressure atmosphere is defined betweenthe boss part 71 b, which is rotatably supporting the second scrollrotor 71 at the bottom 22 of the housing 2, and the bottom 22. The highpressure cavity 71 d is connected through the passage 71 e to the centerworking chamber of the plurality of working chambers 12 formed betweenthe scroll vane parts 61 c, 71 d by the highly pressurized workingfluid. Due to this, highly pressurized working fluid flows into the highpressure cavity 71 d, and a first pressure Fb (in the left direction atFIG. 4) acts on the end plate part 71 a.

On the other hand, opposing the pressure Fb acting on the end plate part71 a, a second pressure F12 (in the right direction at FIG. 4), which isthe total pressure from the working fluid, acts on all the workingchambers 12 formed between the spiral shaped scroll vanes 61 c, 71 c ofthe first and second scroll rotor 61, 71. Therefore, if first pressureFb>second pressure F12 is satisfied, even if the thrust bearings 10′,11′ between the second motor rotor 5 and bottom 22 of the housing 2 areomitted, the first and second motor rotors 4, 5 and first and secondscroll rotors 61, 71 rotate without hinderance to rotation.

By setting the first pressure Fb so as to exceed the second pressureF12, the thrust bearings 10′, 11′ between the second motor rotor 5 andbottom 22 of the housing 2 can be made omittable and the structure canbe simplified significantly, allowing costs to be cut.

Third Embodiment

In the above, an explanation was made of an embodiment applied to ascroll type rotary machine as an air-conditioner compressor. The presentinvention can be worked as a rolling piston type rotary machine.

FIG. 5 is a cross-sectional explanatory view schematically showing arolling piston type rotary machine 100 as a third embodiment. In thisrolling piston type rotary machine 100, component substantially the sameas the components in the above-mentioned scroll type rotary machine 1are explained assigned the same reference numerals.

In this rotary machine 100 as well, the housing 2 has an opening sealedby a cover 21. At the inside wall of the housing 2, there is arranged amotor stator 3 having inside surfaces including a step surface designedto enclose the housing interior cavity by the inside surface.

A shaft 101 is inserted in the inside cavity of the motor stator 3through the cover 21 of the housing 2 to the bottom 22 and is supportedby the housing 2. At the shaft 101, first and second rotors 6 operatingat mutually different phases are attached.

The first rotational unit 6 is provided with a first rotor 104 aarranged between the middle plate 102 and first side plate 103 a throughthe shaft 101 and with a first cylinder 105 a arranged eccentric to thefirst rotor 104 a. At the first cylinder 105 a, there is attached amotor rotor 4 rotating with the first cylinder 105 a. At the motor rotor4, a permanent magnet 41 is set.

A first side plate 103 a is rotatably supported by a bearing 106 at aholding part 21 a protruding out from the cover 21 of the housing 2eccentric to the axial center of the shaft 101. The first side plate 103a and first rotor 104 a are rotatably coupled by a driving pin 107embedded in the first side plate 103 a through a depression portion(groove) 108 formed at the first rotor 104 a side.

At a crescent shaped first working chamber 109 a formed between thefirst rotor 104 a and first cylinder 105 a, a first vane 111 a protrudesout by a first spring member 110 a from a first cylinder 105 a towardthe first rotor 104 a. The first vane 111 a abuts against the firstrotor 104 a (refer to FIG. 6).

On the other hand, the second rotational unit 7 is provided with asecond rotor 104 b arranged between the middle plate 102 and second sideplate 103 b through the shaft 101 and with a second cylinder 105 barranged eccentric to the second rotor 104 a. At the second cylinder 105b, there is attached a motor rotor 5 rotating with the second cylinder105 b. At the motor rotor 5, a permanent magnet 51 is set.

The second side plate 103 b is rotatably supported by a bearing 106′ ata holding part 22 a protruding out from the bottom 22 of the housing 2eccentric to the axial center of the shaft 101. The second side plate103 b and second rotor 104 b are coupled by a driving pin 107′ embeddedin the second side plate 103 b through a spot facing portion 108′ formedat the second rotor 104 b side.

At the crescent shaped second working chamber 109 b formed between thesecond rotor 104 b and second cylinder 105 b, a second vane 111 bprotrudes out by a second spring member 110 b from the second cylinder105 b toward the second rotor 104 b. The second vane 111 b abuts againstthe second rotor 104 b.

In the above rotary machine 100, the shaft 101 is inserted toward thebottom 22 through the housing 2 by which it is supported. To suck in,compress, and discharge the low pressure working fluid, the center ofthe cover 21 of the housing 2 has fit in it a suction pipe 112 having asuction port 14 for introducing low pressure working fluid into thehousing 2. Further, the suction pipe 112 is connected with anintroducing cavity 113 formed along the axial center of the shaft 101.

Next, the introducing cavity 113 of the shaft 101 is formed so as toreach, through the suction passages 114 a, 114 b running through theshaft 101 in the radial direction and through the suction passages 115a, 115 b formed at the first and second rotors 104 a, 104 b, thecrescent shaped first and second working chambers 109 a, 109 b formedbetween the first and second rotors 104 a, 104 b and first and secondcylinders 105 a, 105 b. These form low pressure suction passages withrespect to the first and second rotational units 6, 7.

The crescent shaped first and second working chambers 109 a, 109 bformed between the first and second rotors 104 a, 104 b and first andsecond cylinders 105 a, 105 b are formed so as to reach, through thehigh pressure passages 116 a, 116 b running through the first and secondcylinder 105 a, 105 b and through the high pressure passages 117 a, 117b running through the first and second side plates 103 a, 103 b, thedischarge chamber 118 inside the housing 2. These form a high pressuredischarge passage with respect to the first and second rotational units6, 7. At the first and second side plates 103 a, 103 b, reed valves 119are provided shutting and opening the passages leading to the dischargechamber 118. The reed valves 119 open and close under bias from theplate springs 119 s. The discharge chamber 118 inside the housing 2discharges high pressure fluid through the discharge port 15 provided atthe bottom 22 of the housing 2.

Next, the operations of such a rotary machine 100 will be schematicallyexplained based on FIG. 6 and FIG. 7A to FIG. 7C. The operations of onlythe first rotational unit 6 will be explained. Operations of the secondrotational unit 7 are performed similarly at a different phase (180degrees), so explanations thereof are omitted.

If the motor stator 3 is energized, the motor stator 3 is magnetized,and the first motor rotor 4 where the permanent magnet 41 is set andfirst side plate 103 a and first cylinder 105 a rotate. The first sideplate 103 a and first rotor 104 a are coupled through the driving pin107 and depression portion 108, so the first rotor 104 a rotates aboutthe central axis X1 of the shaft 101. The first motor rotor 4 and thefirst side plate 103 a and first cylinder 105 a rotate about the centeraxis X2, different from the central axis X1 of the shaft 101, so thefirst cylinder 105 a rotates around the first rotor 104 a.

If the first cylinder 105 a rotates, at the first working chamber 109 abetween the first rotor 104 a and first cylinder 105 a, one of thevolumes that are defined by the first vane 111 a protruding out throughthe first spring member 110 a is increased. Due to this, the workingfluid is sucked in through the suction passage 114 a of the shaft 101and the suction passage 115 a of the first rotor 104 a into the firstworking chamber 109 a.

On the other hand, the other volume defined by the first vane 111 a isreduced, whereby the working fluid is made a high pressure. Therefore,the working fluid travels from the first working chamber 109 a throughthe high pressure passage 116 a of the first cylinder 105 a and highpressure passage 117 a of the first side plate 103 a, pushes through thereed valve 119, and reaches the discharge chamber 118 inside the housing2. The working fluid can be discharged as high pressure fluid throughthe discharge port 15 provided at the bottom 22 of the housing 2.

The second rotational unit 7 is arranged at the interior of the motorstator 3 in the cavity inside the housing 2 out of phase (by 180degrees) with the first rotational unit 6, so when rotating, a dynamicbalance of the rotational elements can be achieved and vibration can besuppressed.

Such a rotary machine 100 is configured from one motor stator 3 andfirst and second rotational units 6, 7 provided adjoining each other 180degrees out of phase and eccentric to the shaft 101, so the structurecan be made a smaller size and be given a lighter weight, and furtherlower cost can be realized.

Fourth Embodiment

The present invention can be worked as a swing type rotary machine 200shown in FIG. 8.

In such a rotary machine 200, components substantially the same as thecomponents in the above-mentioned scroll type rotary machine 1 androlling piston type rotary machine 100 are explained assigned the samereference numerals.

That is, in the rotary machine 200 as well, the housing 2 has an openingthat is sealed by a cover 21. At the inside wall of the housing 2, thereis arranged a motor stator 3 having inside surfaces including a stepsurface designed to enclose the housing interior cavity by the insidesurface. A shaft 101 is inserted in the inside cavity of the motorstator 3 through the cover 21 of the housing 2 to the bottom 22 and issupported by the housing 2. At the inside cavity of the motor stator 3,there are provided first and second rotational units 6, 7 arrangedadjoiningly and eccentrically 180 degrees out of phase from each other.The space therebetween is divided by a middle plate 102.

The first rotational unit 6 is provided with a first rotor 104 aarranged between the middle plate 102 and first side plate 103 a throughthe shaft 101 and with a first cylinder 105 a arranged eccentric to thefirst rotor 104 a. At the first cylinder 105 a, there is attached amotor rotor 4 rotating with the first cylinder 105 a. At the motor rotor4, a permanent magnet 41 is set.

A driving pin 201 (hereinafter, referred to as a “blade 201”) protrudingout from the first rotor 104 a is swingingly fit to the first cylinder105 a and swingingly couples the first rotor 104 a to the first cylinder105 a.

The first side plate 103 a is rotatably supported by a bearing 106 on aholding part 21 a (eccentric to the shaft 101) protruding out from thecover 21 of the housing 2. Between the first rotor 104 a and firstcylinder 105 a, there is formed a crescent shaped first working chamber109 a. The first working chamber 109 a is defined by the blade 201protruding out from the first rotor 104 a (refer to FIG. 9).

On the other hand, the second rotational unit 7 is provided with asecond rotor 104 b arranged between the middle plate 102 and second sideplate 103 b through the shaft 101 and with a second cylinder 105 barranged eccentric to the second rotor 104 b. At the second cylinder 105b, there is attached the motor rotor 5 rotating with the second cylinder105 b.

The blade 201 protruding out from the second rotor 104 b is swinginglyfit from the second rotor 104 b into the second cylinder 105 b andswingingly couples the second rotor 104 b to the second cylinder 105 b.

The second side plate 103 b is rotatably supported by the bearing 106′at the holding part 22 a (eccentric to the shaft 101) protruding outfrom the bottom 22 of the housing 2.

In such a rotary machine 200, the shaft 101 is inserted toward thebottom 22 through the housing 2 by which it is supported. To suck in,compress, and discharge the low pressure working fluid, there is fitinto the center of the cover 21 of the housing 2, a suction pipe 112having a suction port 14 for introducing low pressure working fluid intothe housing 2. Further, the suction pipe 112 is connected with anintroducing cavity 113 formed along the axial center of the shaft 101.

Next, the introducing cavity 113 of the shaft 101 is formed so as toreach, through the suction passages 114 a, 114 b running through theshaft 101 in the radial direction and through the suction passages 115a, 115 b formed at the first and second rotor 104 a, 104 b, the crescentshaped first and second working chambers 119 a, 119 b formed between thefirst and second rotors 104 a, 104 b and the first and second cylinders105 a, 105 b. These form low pressure suction passages with respect tothe first and second rotational units 6, 7.

The crescent shaped first and second working chambers 109 a, 109 bformed between the first and second rotors 104 a, 104 b and the firstand second cylinders 105 a, 105 b are formed so as to reach, through thehigh pressure passages 116 a, 116 b running through the first and secondcylinders 105 a, 105 b and through the high pressure passages 116 a, 117b running through the first and second side plates 103 a, 103 b, thedischarge chamber 118 inside the housing 2. These form high pressuredischarge passages with respect to the first and second rotational units6, 7. At the first and second side plates 103 a, 103 b, there areprovided reed valves 119 shutting and opening the passages leading tothe discharge chamber 118. The reed valves 119 open and close under biasfrom spring plates 119 s. The discharge chamber 118 inside the housing 2discharges high pressure fluid through the discharge port 15 provided atthe bottom 22 of the housing 2.

Next, the operations for such a rotary machine 200 will be schematicallyexplained based on FIG. 9 and FIG. 10A to FIG. 10C. The operations foronly the first rotational unit 6 will be explained. Operations of thesecond rotational unit 7 are performed similarly at a different phase(180 degrees), so explanations thereof are omitted.

If the motor stator 3 is energized, the motor stator 3 is magnetized,and the first motor rotor 4 where the permanent magnet 41 is set and thefirst side plate 103 a and first cylinder 105 a rotate. The first rotor104 a is swingingly coupled to the first cylinder 105 a through theblade 201. Therefore, the first rotor 104 a rotates together about thecenter axis X1 of the shaft 101.

The first motor rotor 4 and the first side plate 103 a and firstcylinder 105 a rotate about the center axis X2, different from thecenter axis X1 of the shaft 101. The first rotor 104 a rotates togetherwith the first cylinder 105 a while swinging with respect the firstcylinder 105 a through the blade 201, so the first cylinder 105 arotates around the first rotor 104 a.

Due to this, at the working chamber 109 a between the first rotor 104 aand first cylinder 105 a, one of the volumes that are defined by theblade 201 is increased, whereby the working fluid is sucked in throughthe suction passage 114 a of the shaft 101 and the suction passage 115 aof the first rotor 104 a into the working chamber 109 a. The othervolume defined by the blade 201 is reduced, causing a high pressure inthe working fluid, which travels from the working chamber 109 a throughthe high pressure passage 116 a of the first cylinder 105 a and the highpressure passage 117 a of the first side plate 103 a, pushes through thereed valve 119, and reaches the discharge chamber 118 inside the housing2. The working fluid can be discharged as high pressure fluid throughthe discharge port 115 provided at the bottom 22 of the housing 2.

The second rotational unit 7 is arranged at the interior of the motorstator 3 in the cavity inside the housing out of phase (by 180 degrees)with the first rotational unit 6, so when in rotation, dynamic balanceof the rotational elements can be achieved and vibration can besuppressed.

Such a rotary machine 200 is configured from one motor stator 3 andfirst and second rotational units 6, 7 installed adjoiningly each other180 degrees out of phase and eccentric to the shaft 101, so thestructure can be made a smaller size and be given a lighter weight, andfurther lower cost can be realized.

The rotary machine of the present invention was explained as acompressor in the embodiments, however, the rotary machine of thepresent invention can also be made to operate as a generator convertingthe energy of high pressure working fluid into electric energy forextraction.

For example, the scroll type rotary machine 1 of the first embodimentcan also be operated, with the reed valves 16 and spring members 16 sremoved, with the discharge port 15 acting as an inflow port for highpressure working fluid, and with the suction port 14 acting as an outletfor low pressure working fluid.

In a scroll type rotary machine 1 in this case, the high pressureworking fluid introduced from the discharge port 15 induces rotation ofthe first and second scroll rotors 61, 71. At the working chambers 12formed between the scroll vane parts 61 c, 71 c, the working fluid ismade a low pressure working fluid while expanding from the centerworking chamber 12 to the outer working chambers 12 and is dischargedfrom the suction port 14.

At such a time, the first and second motor rotors 4, 5 rotate by therotation of the first and second scroll rotors 61, 71, generating in thecoil 3 c at the motor stator 3 an induced current which can be extractedas electricity from the hermetic terminal 17 at the bottom 22 of thehousing 2.

1. A rotary machine sucking in working fluid through a suction port intoits housing to render it a high pressure and discharging it through adischarge port, provided with a motor stator provided at an insidecircumferential surface of the housing and having inside surfaces, whichinclude a step surface, designed to enclose a housing interior cavity bythe inside surfaces; first and second motor rotors arranged at theinsides of the inside surfaces separated by the step surface of themotor stator; and first and second rotational units, the first andsecond rotational units coupled to the first and second motor rotorsrespectively, and the first and second rotational units supported at thehousing adjoiningly and eccentrically to each other; the first andsecond rotational units further provided with working chambers, thevolumes of the working chambers formed by the first and secondrotational units made variable by rotation together with the first andsecond motor rotors, which render the working fluid sucked in throughthe suction port a high pressure by reduction of the volumes; and highpressure working fluid being discharged from the working chambersthrough the discharge port.
 2. A rotary machine sucking in working fluidthrough a suction port into its housing and able to rotate by expansionof the fluid, provided with a motor stator provided at an insidecircumferential surface of the housing and having inside surfaces whichinclude a step surface designed to enclose a housing interior cavity bythe inside surfaces; first and second motor rotors arranged at theinsides of the inside surfaces separated by the step surface of themotor stator; and first and second rotational units, the first andsecond rotational units coupled to the first and second motor rotorsrespectively, and the first and second rotational units supported at thehousing adjoiningly and eccentrically to each other; the first andsecond rotational units further provided with working chambers, thevolumes of the working chambers formed by the first and secondrotational units made variable by rotation of the first and secondrotational units, which expand the working fluid introduced into thehousing; and expansion of the working fluid by the working chamberscausing the first and second rotational units and the first and secondmotor rotors to rotate so as to extract electricity.
 3. A rotary machineas set forth in claim 1, wherein the first and second rotational unitsare first and second rotational units in a scroll type rotary machine,the first and second rotational units provided with a first scroll rotorand a second scroll rotor eccentrically engaging with the first scrollrotor; and the first and second scroll rotors are rotatably supported atthe housing by respective bearings adjoining and eccentric to eachother, and the first and second scroll rotors are respectively supportedthrough the first and second motor rotors by thrust bearings at thehousing in the thrust direction.
 4. A rotary machine as set forth inclaim 1, wherein the first and second rotational unit are first andsecond rotational units in a scroll type rotary machine, the first andsecond rotational units provided with a first scroll rotor having asubstantially circular end plate part and spiral shaped scroll vane partand a second scroll part having a substantially circular end plate partand spiral shaped scroll vane part; the scroll vane parts of the firstscroll rotor and second scroll rotor engage eccentrically with eachother to thereby form a plurality of working chambers taking in workingfluid and rendering it high pressure between the scroll vane parts; anda high pressure cavity is defined inside of the inside wall at the sideopposite to the discharge port in the housing so that a first pressureis applied to either of the end plate parts of the first or secondscroll rotor, a second pressure applied to the plurality of the workingchambers as a whole being set so as to become smaller than the firstpressure so as to eliminate the bearing for receiving the force in thethrust direction for the inside wall of the housing at the side definingthe high pressure cavity.
 5. A rotary piston type rotary machine suckingin working fluid through a suction port into its housing to render it ahigh pressure and discharging it through a discharge port, provided witha motor stator provided at an inside circumferential surface of thehousing and having inside surfaces, which include a step surface,designed to enclose a housing interior cavity by the inside surfaces;first and second motor rotors arranged at the insides of the insidesurfaces separated by the step surface of the motor stator; and firstand second rotational units, the first and second rotational unitscoupled to the first and second motor rotors respectively, and the firstand second rotational units supported at the housing adjoiningly andeccentrically to each other; the first and second rotational unitsprovided with first and second rotors respectively arranged between afirst side plate and middle plate or between the middle plate and asecond side plate through a shaft, first and second cylinders arrangedeccentric to the first and second rotors respectively, first and secondworking chambers respectively formed between the first rotor and firstcylinder or between the second rotor and second cylinder, and first andsecond vanes protruding out from the first and second cylinders towardthe first and second rotors in the first and second working chambers soas to abut against the first and second rotors by first and secondspring members.
 6. A swing type rotary machine sucking in working fluidthrough a suction port into its housing to render it a high pressure anddischarging it through a discharge port, provided with a motor statorprovided at an inside circumferential surface of the housing and havinginside surfaces, which include a step surface, designed to enclose ahousing interior cavity by the inside surfaces; first and second motorrotors arranged at the insides of the inside surfaces separated by thestep surface of the motor stator; and first and second rotational units,the first and second rotational units coupled to the first and secondmotor rotors respectively, and the first and second rotational unitssupported at the housing adjoiningly and eccentrically to each other;the first and second rotational units provided with first and secondrotors respectively arranged between a first side plate and middle plateor between the middle plate and a second side plate through a shaft,first and second cylinders arranged eccentric to the first and secondrotors respectively, first and second working chambers respectivelyformed between the first rotor and first cylinder or between the secondrotor and second cylinder, and first and second driving pins providedprotruding out from the first and second rotors and coupling the firstand second rotors to the first and second cylinders swingingly.
 7. Arotary machine as set forth in claim 1, wherein the first and secondrotational unit are 180 degrees out of phase with each other and arearranged inside of the motor stator in the cavity inside the housing.